With web sites and portals, it is similar to the construction of the house. At first view, also poorly built house can look good, but the problem occurs after you start to live in the house. Thin walls, crackling walls poorly made plumbing and other imperfections, or poorly done work can carve nice inconvenience.
It is the same with the web site or portal. Incorrect programming of the web page will not be displayed properly on all browsers and resolutions will be read slowly which may discourage its visitors when browsing, but also affect placement in search engines, can be easily hacked and many other problems.
Programming is even more important with portals since they record in most cases much more visitors than web sites and and in high visitation badly programmed portal will disproportionately burden the server and will be slow and unstable as reflected by a significant decline in visitation, therefore a waste of resources and do not forget that server will cost no small charges.